Pool Shock Power Blast (68% Cal Hypo) 24x1 Lb Bag - R20841-24

$75.99

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Model # R20841-24

  4.67 Average  

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Model # R20841-24

Product Description

Cal-Shock 65  

Power Blast Cal Shock 65 is 68% Calcium Hypochlorite with 65% available chlorine. Our best selling shock treatment, Cal Shock 65 is in a fast dissolving granular form so it quickly destroys organic waste, algae and bacteria saving you time and money. 
  • 1 lb bags Calcium Hypochlorite
  • Powerful shock treatment great for spring start up
  • Gives quick chlorine boost
  • Ensure pool water is balanced for best results
  • Complete instructions for dosage on container
  • Compares To BioGuard Burn Out


For More Pool Chemicals

Product Specifications

# of 1 lb Bags:
24
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?     Asked on 3/11/2017 by

I have a vinyl in-ground salt water swimming pool and last summer my chlorine levels would always drop quickly. I used tablets to keep the chlorine level in range for longer, is this ok? I was also told I should shock my pool every 2 weeks. Would you recommend this treatment and if so given the pool I have, which shock do you recommend and how often would you recommend I shock it?

A     Answered on 3/13/2017 by InyoPools Product Specialist Scott W.

If you have your Cyanuric Acid between 40-50 ppm your salt system should have no problem keeping chlorine in the pool.

?     Asked on 3/14/2015 by Robert

Is this shock safe for my above ground pool?

A     Answered on 3/16/2015 by InyoPools Product Specialist Robert M.

Hello Robert - This shock is safe for your above ground pool. We would recommend dissolving the shock in a bucket of water before it is poured into the pool.

?     Asked on 5/10/2013 by Guest

Will this shock increase my pH level? I need a shock that wont.

A     Answered on 5/10/2013 by InyoPools Product Specialist Patrick P.

Any chlorine based shock will increase the pH. The only type of shock that will not, is a non-chlorine based shock: http://www.inyopools.com/Products/22300006058120.htm

?     Asked on 1/23/2013 by Guest

Do you carry swimming pool shock that is 100% calcium hypochlorite?

A     Answered on 1/23/2013 by InyoPools Product Specialist Patrick P.

Unfortunately due to how unstable calcium hypochlorite is, there is no such thing. Our Zappit shock is one of the strongest on the market.

?     Asked on 12/20/2012 by Guest

I think I have a chlorine lock in my swimming pool. How did I get it and how can I get rid of it?

A     Answered on 12/20/2012 by InyoPools Product Specialist Patrick P.

Chlorine lock is a condition in your swimming pool when the chlorine levels ( free chlorine and total chlorine) are not the same which makes the chlorine useless. You can read more here.

?     Asked on 12/20/2012 by Guest

What type of shock should I use in a bromine swimming pool?

A     Answered on 12/20/2012 by InyoPools Product Specialist Patrick P.

If you are using bromine, you will want to use a non-chlorine shock. The non-chlorine shock will help sanitize the water through oxidation.

?     Asked on 12/20/2012 by Guest

Is there any way to prevent hair from turning green in the swimming pool.

A     Answered on 12/20/2012 by InyoPools Product Specialist Patrick P.

The best way to prevent this is to treat for metals on a regular basis. Metal free can be used as part of your regular maintenance.

?     Asked on 12/20/2012 by Guest

I shocked my swimming pool and it turned green shortly afterward. What would cause that?

A     Answered on 12/20/2012 by InyoPools Product Specialist Patrick P.

The change in color likely stemmed from the chlorine shock oxidizing the metals in your swimming pool. You can use this how to guide to get your swimming pool clear again.

?     Asked on 10/25/2012 by Guest

My swimming pool is clear but when my kids and I went swimming, our eyes burned. My neighbor came by and checked and said that the pool should be fine because he can smell the chlorine. What is wrong with my pool?

A     Answered on 10/25/2012 by InyoPools Product Specialist Patrick P.

It sounds like you have chloramines. Chloramines are formed any time ammonia and nitrogen are in the water. Chloramines smell bad and cause skin and eye irritation. You can resolve the problem using this method.

?     Asked on 10/25/2012 by Guest

I keep the chemical levels (pH, alkalinity, calcium hardness, cyanuric acid and chlorine)in my pool within range but the water just doesn't seem right. Am I doing something wrong? Is there something I am missing?

A     Answered on 10/25/2012 by InyoPools Product Specialist Patrick P.

I noticed you didn't mention your phosphates.  I would recommend checking the phosphate levels and using a phosphate remover as needed.

?     Asked on 10/25/2012 by Guest

Why do I need to shock the pool if I use chlorine tablets?

A     Answered on 10/25/2012 by InyoPools Product Specialist Patrick P.

Chlorine tablets alone are not enough to keep the water sanitized. Pool shock helps to oxidize the water as well as breakdown chloramines.

?     Asked on 10/25/2012 by Guest

My pool company uses liquid shock in my pool. Is this granular shock any better?

A     Answered on 10/25/2012 by InyoPools Product Specialist Patrick P.

Yes. If you look at the labels of both products, you will find that liquid shock is weaker. The bottle has vented caps (to vent chlorine gas) so the longer it sits on a shelf, the weaker it gets. Granular shock is a lot stronger and does not lose its strength as long as it's stored properly.

?     Asked on 10/19/2012 by Guest

No matter how much chlorine shock I put in my pool the chlorine level is always low. What can I do?

A     Answered on 10/19/2012 by InyoPools Product Specialist Patrick P.

I would first make sure that you are testing the total chlorine AND free chlorine. If they are not the same reading, you may have a chlorine lock. If the chlorine levels are the same, I would check the pH, alkalinity and cyanuric acid levels.

?     Asked on 10/18/2012 by Guest

I have an in ground vinyl swimming pool and usually use liquid shock. I have heard that the granular shock is better but it's not for vinyl pools. Is there another type of shock that I can use that is stronger than the liquid?

A     Answered on 10/18/2012 by InyoPools Product Specialist Patrick P.

You can use the granular shock but I would recommend adding it to a bucket of pool water to pre-dissolve it then pouring it along the perimeter of the pool.

?     Asked on 10/12/2012 by Guest

I tested my chlorine levels and they were at 0, so I shocked it. This didn't bring the levels up at all. What could be the problem and what should I do?

A     Answered on 10/12/2012 by InyoPools Product Specialist Patrick P.

If your chlorine level remained at 0 after shocking, I would recommend checking the pH, alkalinity and cyanuric acid levels. I would also recommend checking the available chlorine percentage on the pool shock.

?     Asked on 1/25/2012 by Guest

I'm looking for pool shock to sanitize my drinking water. Will this work?

A     Answered on 1/25/2012 by InyoPools Product Specialist Patrick P.

I have heard of people using pool shock to sanitize drinking water but I can not promote the use of any pool shock for this purpose. You will want to contact the NSF for further information.

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